Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area
Based on collaboration with the Greenlandic fishing fleet, we document the presence of Atlantic bluefin tuna (Thunnus thynnus) in most years from 2012 to 2018 in the waters east of Greenland (northern Irminger Sea). In total, 84 individuals have been registered as bycatch in the commercial fisheries...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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2021
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Online Access: | http://dx.doi.org/10.1139/cjfas-2020-0156 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2020-0156 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2020-0156 |
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crcansciencepubl:10.1139/cjfas-2020-0156 2024-09-09T19:38:43+00:00 Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area Jansen, Teunis Nielsen, Einar Eg Rodriguez-Ezpeleta, Naiara Arrizabalaga, Haritz Post, Søren MacKenzie, Brian R. 2021 http://dx.doi.org/10.1139/cjfas-2020-0156 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2020-0156 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2020-0156 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 78, issue 4, page 400-408 ISSN 0706-652X 1205-7533 journal-article 2021 crcansciencepubl https://doi.org/10.1139/cjfas-2020-0156 2024-08-29T04:08:48Z Based on collaboration with the Greenlandic fishing fleet, we document the presence of Atlantic bluefin tuna (Thunnus thynnus) in most years from 2012 to 2018 in the waters east of Greenland (northern Irminger Sea). In total, 84 individuals have been registered as bycatch in the commercial fisheries in Greenland waters, which indicates that the first catch of three individuals in 2012 was not a single extreme observation, but that East Greenland waters have become a new outer limit of an expanded tuna habitat. Genetic analyses indicate that specimens from this region are mostly of Mediterranean origin with a small proportion originating from the Gulf of Mexico stock. Stomach content analysis suggests that the main prey is Atlantic mackerel (Scomber scombrus). The tunas ranged in size from 140 to 270 cm, corresponding to an estimated age range of 5–16 years; most were probably mature. The wide size–age range suggests that many year classes are participating in the migration to this region. Sea temperatures during summer have been above the long-term average in recent years of interest. Summer residence of bluefin tuna in the region could be due to a combination of increasing temperatures and higher overall abundances of both bluefin tuna and a key prey species (Atlantic mackerel). Article in Journal/Newspaper East Greenland Greenland greenlandic Canadian Science Publishing Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Canadian Journal of Fisheries and Aquatic Sciences 78 4 400 408 |
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Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Based on collaboration with the Greenlandic fishing fleet, we document the presence of Atlantic bluefin tuna (Thunnus thynnus) in most years from 2012 to 2018 in the waters east of Greenland (northern Irminger Sea). In total, 84 individuals have been registered as bycatch in the commercial fisheries in Greenland waters, which indicates that the first catch of three individuals in 2012 was not a single extreme observation, but that East Greenland waters have become a new outer limit of an expanded tuna habitat. Genetic analyses indicate that specimens from this region are mostly of Mediterranean origin with a small proportion originating from the Gulf of Mexico stock. Stomach content analysis suggests that the main prey is Atlantic mackerel (Scomber scombrus). The tunas ranged in size from 140 to 270 cm, corresponding to an estimated age range of 5–16 years; most were probably mature. The wide size–age range suggests that many year classes are participating in the migration to this region. Sea temperatures during summer have been above the long-term average in recent years of interest. Summer residence of bluefin tuna in the region could be due to a combination of increasing temperatures and higher overall abundances of both bluefin tuna and a key prey species (Atlantic mackerel). |
format |
Article in Journal/Newspaper |
author |
Jansen, Teunis Nielsen, Einar Eg Rodriguez-Ezpeleta, Naiara Arrizabalaga, Haritz Post, Søren MacKenzie, Brian R. |
spellingShingle |
Jansen, Teunis Nielsen, Einar Eg Rodriguez-Ezpeleta, Naiara Arrizabalaga, Haritz Post, Søren MacKenzie, Brian R. Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area |
author_facet |
Jansen, Teunis Nielsen, Einar Eg Rodriguez-Ezpeleta, Naiara Arrizabalaga, Haritz Post, Søren MacKenzie, Brian R. |
author_sort |
Jansen, Teunis |
title |
Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area |
title_short |
Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area |
title_full |
Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area |
title_fullStr |
Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area |
title_full_unstemmed |
Atlantic bluefin tuna ( Thunnus thynnus) in Greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area |
title_sort |
atlantic bluefin tuna ( thunnus thynnus) in greenland — mixed-stock origin, diet, hydrographic conditions, and repeated catches in this new fringe area |
publisher |
Canadian Science Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1139/cjfas-2020-0156 https://cdnsciencepub.com/doi/full-xml/10.1139/cjfas-2020-0156 https://cdnsciencepub.com/doi/pdf/10.1139/cjfas-2020-0156 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
East Greenland Greenland greenlandic |
genre_facet |
East Greenland Greenland greenlandic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 78, issue 4, page 400-408 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2020-0156 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
78 |
container_issue |
4 |
container_start_page |
400 |
op_container_end_page |
408 |
_version_ |
1809907631518646272 |